Ubuntu
alsa-driver package

  1. Bug #1104565
  2. Comment #5

Comment 5 for bug 1104565

Revision history for this message
David Henningsson (diwic) wrote : Re: [Regression] No sound through headphone jack since last update of ubuntu 12.04.1LTS

So, the new PulseAudio update is able to detect "Front headphone jack", which in your case correctly switches output to headphones instead of speakers.

This causes a regression due to PulseAudio muting the speakers when the headphones are plugged in, in combination with a kernel driver bug: the "Speaker" volume control actually controls the volume of the headphones (!).

Possible workarounds include:

1) Move to the linux-image-generic-lts-quantal kernel
or
2) Use the latest drivers https://wiki.ubuntu.com/Audio/UpgradingAlsa/DKMS
or
3) Edit /usr/share/pulseaudio/alsa-mixer/paths/analog-output-headphones.conf
and change from:

[Element Speaker]
switch = off
volume = off

to:

[Element Speaker]
switch = mute
volume = merge